﻿function CalConv()
 {
	FIRSTYEAR = 1998;
	LASTYEAR = 2031;

	today = new Date();
	SolarYear = today.getFullYear();
	SolarMonth = today.getMonth() + 1;
	SolarDate = today.getDate();
	Weekday = today.getDay();
	LunarCal = [
 new tagLunarCal( 27, 5, 3, 43, 1, 0, 0, 1, 0, 0, 1, 1, 0, 1, 1, 0, 1 ),
 new tagLunarCal( 46, 0, 4, 48, 1, 0, 0, 1, 0, 0, 1, 0, 1, 1, 1, 0, 1 ), /* 88 */
 new tagLunarCal( 35, 0, 5, 53, 1, 1, 0, 0, 1, 0, 0, 1, 0, 1, 1, 0, 1 ), /* 89 */
 new tagLunarCal( 23, 4, 0, 59, 1, 1, 0, 1, 0, 1, 0, 0, 1, 0, 1, 0, 1 ),
 new tagLunarCal( 42, 0, 1, 4, 1, 1, 0, 1, 0, 1, 0, 0, 1, 0, 1, 0, 1 ),
 new tagLunarCal( 31, 0, 2, 9, 1, 1, 0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 0 ),
 new tagLunarCal( 21, 2, 3, 14, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0, 1 ), /* 93 */
 new tagLunarCal( 39, 0, 5, 20, 0, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1 ),
 new tagLunarCal( 28, 7, 6, 25, 1, 0, 1, 0, 1, 0, 1, 0, 1, 1, 0, 1, 1 ),
 new tagLunarCal( 48, 0, 0, 30, 0, 0, 1, 0, 0, 1, 0, 1, 1, 1, 0, 1, 1 ),
 new tagLunarCal( 37, 0, 1, 35, 1, 0, 0, 1, 0, 0, 1, 0, 1, 1, 0, 1, 1 ), /* 97 */
 new tagLunarCal( 25, 5, 3, 41, 1, 1, 0, 0, 1, 0, 0, 1, 0, 1, 0, 1, 1 ),
 new tagLunarCal( 44, 0, 4, 46, 1, 0, 1, 0, 1, 0, 0, 1, 0, 1, 0, 1, 1 ),
 new tagLunarCal( 33, 0, 5, 51, 1, 0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 0, 1 ),
 new tagLunarCal( 22, 4, 6, 56, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0 ), /* 101 */
 new tagLunarCal( 40, 0, 1, 2, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0 ),
 new tagLunarCal( 30, 9, 2, 7, 0, 1, 0, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1 ),
 new tagLunarCal( 49, 0, 3, 12, 0, 1, 0, 0, 1, 0, 1, 1, 1, 0, 1, 0, 1 ),
 new tagLunarCal( 38, 0, 4, 17, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 1, 1, 0 ), /* 105 */
 new tagLunarCal( 27, 6, 6, 23, 0, 1, 0, 1, 0, 0, 1, 0, 1, 0, 1, 1, 1 ),
 new tagLunarCal( 46, 0, 0, 28, 0, 1, 0, 1, 0, 0, 1, 0, 1, 0, 1, 1, 0 ),
 new tagLunarCal( 35, 0, 1, 33, 0, 1, 1, 0, 1, 0, 0, 1, 0, 0, 1, 1, 0 ),
 new tagLunarCal( 24, 4, 2, 38, 0, 1, 1, 1, 0, 1, 0, 0, 1, 0, 1, 0, 1 ), /* 109 */
 new tagLunarCal( 42, 0, 4, 44, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1 ),
 new tagLunarCal( 31, 0, 5, 49, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0 ),
 new tagLunarCal( 21, 2, 6, 54, 0, 1, 0, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1 ),
 new tagLunarCal( 40, 0, 0, 59, 0, 1, 0, 0, 1, 0, 1, 1, 0, 1, 1, 0, 1 ), /* 113 */
 new tagLunarCal( 28, 6, 2, 5, 1, 0, 1, 0, 0, 1, 0, 1, 0, 1, 1, 1, 0 ),
 new tagLunarCal( 47, 0, 3, 10, 1, 0, 1, 0, 0, 1, 0, 0, 1, 1, 1, 0, 1 ),
 new tagLunarCal( 36, 0, 4, 15, 1, 1, 0, 1, 0, 0, 1, 0, 0, 1, 1, 0, 1 ),
 new tagLunarCal( 25, 5, 5, 20, 1, 1, 1, 0, 1, 0, 0, 1, 0, 0, 1, 1, 0 ), /* 117 */
 new tagLunarCal( 43, 0, 0, 26, 1, 1, 0, 1, 0, 1, 0, 1, 0, 0, 1, 0, 1 ),
 new tagLunarCal( 32, 0, 1, 31, 1, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0, 0 ),
 new tagLunarCal( 22, 3, 2, 36, 0, 1, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0 ) ];
 /* 民國年每月之日數 all by www.qpsh.com*/
 SolarCal = [ 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 ];

 /* 民國年每月之累積日數, 平年與閏年 */ 
SolarDays = [ 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365, 396, 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366, 397 ];
	
	
	if ( SolarYear <= FIRSTYEAR || SolarYear > LASTYEAR ) return 1;
	sm = SolarMonth - 1;
		if ( sm < 0 || sm > 11 ) return 2;
		leap = GetLeap( SolarYear );
	if ( sm == 1 )
		d = leap + 28;
	else
		d = SolarCal[sm];
	if ( SolarDate < 1 || SolarDate > d ) return 3;
	y = SolarYear - FIRSTYEAR;
	acc = SolarDays[ leap*14 + sm ] + SolarDate;
	kc = acc + LunarCal[y].BaseKanChih;
	Kan = kc % 10;
	Chih = kc % 12;
	
	Age = kc % 60;
	if ( Age < 22 )
		Age = 22 - Age;
	else
		Age = 82 - Age;
	
	if ( acc <= LunarCal[y].BaseDays ) {
		y--;
		LunarYear = SolarYear - 1;
		leap = GetLeap( LunarYear );
		sm += 12;
		acc = SolarDays[leap*14 + sm] + SolarDate;
	 }
	else
		LunarYear = SolarYear;
			l1 = LunarCal[y].BaseDays;
	for ( i=0; i<13; i++ ) {
		l2 = l1 + LunarCal[y].MonthDays[i] + 29;
		if ( acc <= l2 ) break;
		l1 = l2;
	 }
	LunarMonth = i + 1;
	LunarDate = acc - l1;
	im = LunarCal[y].Intercalation;
	if ( im != 0 && LunarMonth > im ) {
		LunarMonth--;
		if ( LunarMonth == im ) LunarMonth = -im;
	 }
	if ( LunarMonth > 12 ) LunarMonth -= 12;
 today=new Date();
 function initArray(){
 this.length=initArray.arguments.length
 for(var i=0;i<this.length;i++)
 this[i+1]=initArray.arguments[i] }
 var d=new initArray("星期日","星期一","星期二","星期三","星期四","星期五","星期六");
 document.write("", getFullYear(today),"年",today.getMonth()+1,"月",today.getDate(),"日&nbsp;",d[today.getDay()+1],"");
 
 months = ["一","二","三","四","五","六","七","八","九","十","十一","十二"];
 
 days = ["初一","初二","初三","初四","初五","初六","初七","初八","初九","初十","十一","十二","十三","十四","十五","十六","十七","十八","十九","二十","廿一","廿二","廿三","廿四","廿五","廿六","廿七","廿八","廿九","三十"];
 
	 document.write( "&nbsp;农历"+months[LunarMonth-1]+"月" + days[LunarDate-1] + "");
 
 return 0; 
}
 /* 求此民國年是否為閏年, 返回 0 為平年, 1 為閏年 */
function GetLeap( year )
 {
 if ( year % 400 == 0 )
 return 1;
 else if ( year % 100 == 0 )
 return 0;
 else if ( year % 4 == 0 )
 return 1;
 else
 return 0;
 }
function tagLunarCal( d, i, w, k, m1, m2, m3, m4, m5, m6, m7, m8, m9, m10, m11, m12, m13) {
 this.BaseDays = d; /* 到民國 1 月 1 日到農曆正月初一的累積日數 */
 this.Intercalation = i; /* 閏月月份. 0==此年沒有閏月 */
 this.BaseWeekday = w; /* 此年民國 1 月 1 日為星期幾再減 1 */
 this.BaseKanChih = k; /* 此年民國 1 月 1 日之干支序號減 1 */
 this.MonthDays = [ m1, m2, m3, m4, m5, m6, m7, m8, m9, m10, m11, m12, m13 ]; /* 此農曆年每月之大小, 0==小月(29日), 1==大月(30日) */
}